A private trailer at Ground Zero that’s been used by 9/11 family members to mourn their loved ones over the last four years will be relocated this month to make way for construction at the World Trade Center, The Post has learned.

Known as “the Family House,” the trailer is filled with photos and mementos of victims of the terror attacks and has been visited by thousands of relatives since it first opened in September 2002. It is open only to 9/11 relatives.

With construction at the World Trade Center pushing forward, the Port Authority met with several key family advisory groups to come up with a new location for a family viewing room. It was decided the room should be moved to an area above the PATH station.

“We worked closely with 9/11 family members to continue to provide them with a quiet, dignified place on the site where they can grieve their loss,” said Port Authority Executive Director Anthony Shorris.

Relatives will gather on Feb. 27 to move the collection of photos and other personal memorabilia that has adorned the current Family House to its new location.